Deep-well pump



April 19, 1932. H. w. BRADSHAW 1,854,175

DEEP WELL PUMP Filed July 26, 1930 ATTORNEYS.

Patented Apr. 19, 1932 UNITED STATES PATENT OFFICE HERBERT W. BRAnsIIAw, or HUNTINGTON PARK, CALIFORNIA, AssIGNoR or ONE- HALF 'ro ROBERT n. rnARsON, or Los ANGELES, CALIFORNIA Briar-WELL PUMP Application filed July 26, 1930. Serial No. 470,816.

rThis invention relates to a novel pump construction for use in oil wells and in other drilled wells wherein the bore is provided with a. fluid-tight casing.

[i More specifically the invention relates to a pump of the variety wherein a pump casing is provided of a character which is adapted to be lowered into a well casing and which has mounted upon or within it means, opperable from the top of the well, whereby it may be releasably secured to the well casing at the desired point, ,and also means whereby a water tight joint or packed connection may be afforded between the exterior surface of the pump casing and the interiorY surface of the well casing. Vrlhe provision of this fluidtight connection is important in order that,

' as the pumping element within the pump casing draws the liquid up through said casing such liquid be prevented from leaking down around the pump casing-to the point from which it Awas pumped.

An object of the invention is to provide improved means for makin@ arfluid tight connection between the pumplarrel or casing and the inner surface of the well casing whereby the column of liquid within the well casing above the pump barrel will be safely prevented from leaking down past the pump 35 barrel.

VAnother object of the invention is to -provide, in conjunction with the leak preventing feature above mentioned, an improved clutching or gripping` device to lock the S pump barrel within the well ,casing against vertical displacement during the operation of the pump.

A further object of the invention is to pro.- vide improved means to operate simultaneously both the packing means and the means to grip or clutch the well casing.

Still other objects, advantages 'and features of invention may hereinafter appear.

Referring to the accompanying drawings, which illustrate what is at present deemed to be a preferred embodiment of the invention, c

Fig. 1 is a plan view showing thefdevice within a well casing in position for use, the weight being omitted.

Fig. 2 is a longitudinal mid-section, 0.11 line 2-2 of Fig. 1, showing a portion of a well casing in which the device is contained, the parts thereof being in the released or operative position.

. Fig. 3 is a reproduction of the right hand portion of Fig. 2 except that the device is shown in thelocked or inoperative position.

Fig. 4 is a cross section on line 4-4 of Fig. 2. l

. 5 is a cross section on line 5-5 of VFig; 6 is a cross section on line 6,-,6 of Fig. 2. y

Fig. 7 is ay cross section on line 7 7 of Fig. 8 is a cross Fig. 2. .y

v Fig. 9 is a section on line 9-9 of Fig. 7.

Fig. l0 isv an enlarged view of the adjacent portion of Fig. 3. Fig. 11 is an enlarged reproduction of part of the upper portion of Fig. 2 showing the dogs in a dierent position.

Referring in detail to the drawings, and

more particularly to Fig. 2, the device is shown mounted within a well casing 4 and includes a pump barrel or outer casing 5 which is preferably made up in sections as, for example, a strong, relatively thick lower section 6 having a base portion 7 which is closed except for the intake passage 8, 'which is guarded bythe ball check valve 9.'

The upper end of thisk section 6 is provided with an inwardly directed liange4 10 and has secured to it the' lower `end of the upper section 11 which is desirably a cylindrical tube having a thinner wall than the lower section 6. The upper end of the tubular member 11 has screwed thereinto or otherwise secured thereto an internal Vcollar 12. Said collar has a peripheral iange 18 which extends radially beyond the end portion of tube 11.

Vithin the pump casing 5 there is mounted axially thereof a pump piston cylinder 15 within which the pump piston 16 has a work-v ing fit. Said piston cylinder 15 is of less diameter than the pump casing section 11, thereby providing an annular space 17 besection on line 8&8 of

tween said piston cylinder and the upper section 11 of the pump casing.

The piston cylinder 15 has a free working fit inside the annular flange 10 which has already been referred to, the lower end of said cylinder 15 having screwed thereinto or otherwise secured thereto a head 20. Said head 2O has a downwardly tapered middle portion 22 and a cylindrical lower portion 23. On to the lower end of said portion 23 is screwed head 24 of an inverted, frusto conical character which is preferably of the same general shape as the upper half of the head 20.

The upper head 2O is provided with an axial passage or bore 20a and the lower head 24 has a like axial passage 24a which alines with the passage 20a of the upper head.

Describing now more in detail the lower section 6 of the pump casing 5, this part of the pump casing is of a tubular character and, in addition to its inwardly directed top flange 10, is provided at about its mid-length with an inwardly directed annular shoulder 30 formed along the lower side of an annular ledge 31, the upper surface 32 of said ledge tapering as shown. Through this tapered portion 32 extend a plurality of circumferentially spaced openings to receive the gripping or clamping jaws 35, said jaws having toothed portions 36 adapted to grip the well casing 5.

Said jaws 35 are provided with inwardly directed inclined faces 35a adapted to be engaged by the cam face 22 of the head 20 for the purpose of forcing said jaws out into gripping engagement with the well casing. The force required to do this is supplied by means of two relatively heavy compression springs 40 and 41, the spring 40 acting between the annular flange 10 of the pump barrel and the upper head 20, and the spring 41 acting between the annular shoulder 30 and the lower head 24.

In order to form a fluid-tight fit between the pump casing and the well casing, a packing 45, preferably a rubber annulus, is positioned in a peripheral groove provided therefor around the lower portion of the pump casing.

The inner surface of the expansible packing ring 45 is engageable by the followers 46 which have shanks 47 that extend through apertures through an annular guide member 48. When the cam members 20 and 24 move downwardly relative to the pump casing, the inner ends of said Shanks 47 are engaged by the cam face 240 of the head 24 and are thereby forced outwardly thus expanding the packing 45 in order to make a fluid tight connection between the pump casing and the well casing.

The pump piston 16 is provided with the fluid delivery passage which is guarded by the check valves 61 and 62. rl`he upper end of said piston has a tapered shank 63 through which lead the passages 64 affording outlets from passage 60. The rod 65 is attached to the upper end of shank 63. Near the point of its attachment said rod is led through and has attached to it, a block 66 having in its edges grooves 67.

1n order to condition the device for being lowered into the well casing, the packing 45 y and gripping elements 35 are maintained in their retracted positions by means of a plurality of dogs 70 which cooperate with said block 66. Each of these dogs is disposed radially with relation to the piston cylinder 15 and is pivotally connected with the upper end of said piston cylinder. For this purpose an external ring 71 is screwed upon or otherwise secured to the upper end of said piston cylinder, and this ring is provided with recesses within each of which one of the dogs 7 0 is pivotally mounted between its ends.

At its inner end each dog 7() is provided with an angular nose portion 75 which is engageable with a notch 67 as shown in Fig. 3 in order to maintain the packing element 45 and the aws 35 in the retracted positions, as shown in Fig. 3 while the device is being lowered within the well casing in order to position the pump at the proper level. While the dogs are thus positioned they maintain the piston cylinder 15 and cam members 20 and 24 in the upper-position relative to the pump casing against the opposition of springs 40 and 41. TVl/'hen it is desired to release the dogs 7 O from the notches 67 a sudden upward jerk is given to the rod 65 thus freeing the dogs from said notches allowing said springs to force outwardly not only the gripping `iaws 35 but also the packing compressing followers 46.

Referring to certain details of construction at the upper end of the pump cylinder 15, the collar or closure member 12 is provided with an internally project-ing flange 12x which supports a packing device 12e in order to form a fluid tight t between said collar and piston cylinder.

At the lower end of the pump casing, the head 7 is provided with a plurality of ducts 80 which communicate with a circular chan- 115 nel 81 located between the head 7 and the eX- ternally screw threaded member 48. From said channel 81 a series of ducts 82 lead up to the terminal ducts 87 which supply the pressure to the channel 84 formed upon the inner surface of the rubber packing element 45.

Referring to the structure best shown in Fig. 11 and the corresponding parts of Figs. 2 and 3, the pump piston shank 63 is provided with stop shoulders 63a which cooperate with a stop ring 635 carried by the upper end of the piston cylinder 15, thus preventing the complete withdrawal of the pump piston from said cylinder.

The rod 65 which is attached to the upper end of the guide portion 63x of the shank 63 is shown as being of a twisted character. Said rod 65 has mounted thereon a weight (S5/w and said weight is in turn provided with an eyeletted portion 65x to which the suspending cable (not shown) is attached. The object of providing the weight 65u; is to make the pump piston 16 and parts relating thereto sufliciently heavy to insure that the down stroke will take place when the suspending cable is lowered for that purpose Vin the pumping operation.

When it is desired to withdraw the coniplete pumping device from the wellcasing, it is only necessary to wind up the cable (not shown), thus withdrawing theV weight 651e-, rod 65 and all parts suspended therefrom. The first part of this upward movement of the rod 65 will swing the dogs 7 0 from the position shown in Fig. 2 to the position shown in F ig. ll. This movement of the dogs will occur by reason of the tapered shank 63 engaging said dogs sufiiciently far down the shank to force them out by reason of the increased diameter of the shank at the point where it is engaged by said dogs. This movement of the dogs willl be accompanied by a relative movement of the pump casing 5 and the pump piston cylinder l5, which in turn will cause a removal of the pressure against the interior of the packing ring l5 and will permit the gripping jaws 35 to withdraw, which operations have been previously described.

Claims:

l. A pump barrel having a peripherally disposed packing carried thereby, a plurality of radially movable followers interiorly engaging said packing, a frustro-conical cam member to simultaneously actuate said followers, said cam member having a reduced tubular portion anda transverse shoulder therearound, and a compression spring coiled around said tubular portion and engaging said shoulder to operate said cam member.

2. A pump construction comprising an inner tubular member, an outer tubular member, said tubular members being longitudinally movable with relation to each other, a radially operable gripping element adapted to be projected beyond the periphery of said outer tubular member to gripa well casing, said inner tubular member being provided with a frustro-conical cam portion having a transversely extending end surface, said cam portion being adapted to operate said gripping element, and said outer tubular member having an internally projecting annular liange, a compression spring extending around said inner tubular member and operating between said transverse surface and said liange, latching means operating between said inner tubular member and said outer tubular member, and a device for releasing said latching means to cause said spring to operate said cam member and move said ping element radially outward. j 3. In combination, a pump construction adapted to lit loosely within a well casing; said pump construction comprising an outer tube having apertures through the side walls thereof and an inner tube', packing carried by said outer tube adjacent to said apertures, means adjacent to said apertures to force said packing outwardly against the well casing, said pump comprising a body portion fitted within and longitudinally movable with respect to said inner tube, said body portion being tapered at its upper end and said tapered portion being upwardly and downwardly movable opposite to the upper end of said inner tube, a plurality of dogs pivotally mounted upon the upper end of said inner tube and having an operative engagement with said tapered portion of said pump body, said dogs having base portions which are engageable with the upper end of said outer tube, suspending means for said pump body to raise and lower the same, a recessed member carried by said suspending means, said dogs being adapted to engage the recesses of said member to releasably maintain them in a position in which they hold said inner tube in an elevated relation to said outer tube, and a spring to throw said inner tube downwardly with relation to said outer tube when said dogs are released from said recessed member and thereby operate the aforesaid means which forces said packing outwardly.

In .testimony whereof I hereunto ailiX my signature.

HERBERT W. BRADSHAW.

grip- 

